GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Hagen Koch 1, Stefan Kaden 2, Michael Kaltofen 2 1 Brandenburg University of Technology Cottbus, Chair of Hydrology and Water Resources Management 2 WASY GmbH, Institute for Water Resources Planning and System Research WBalMo Elbe / module Czechia - application fields and first results

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus 1.Contents 1.Relevance for the Overall Model 1.Input Data and Information 1.Development of Modules 1.First Results 1.Conclusion and Outlook 1. Contents

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus -Inflow to Germany at different locations: -GLOWA-ELBE II sub-project Surface Water Availability: investigation of changes in the water availability in the whole Elbe River Basin under global change scenarios 2. Relevance for the Overall Model -Czech Republic covers one third of the Elbe River Basin roughly Main stream of river Labe => Decin / Labe Sub-basin of the river Mulde ice => downstream reservoir Prisecnice / Prisecnice => downstream reservoir Flaje / Flajsk potok -Effects of climate change and reservoir management in the Czech Republic will in all probability have an influence on inflow to Germany

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Basis for Data and Information Agreement of co-operation between GLOWA-ELBE II and the Czech River Basin Authorities Data and information delivered: 3. Input Data and Information reservoirs to be included in the model (name, location, controllable storage, active storage, water surface area, etc.) => reservoirs with capacity equal or larger than 1 mill. m 3 water users, i.e. withdrawals and discharges (name, location, reference number of permit, monthly or yearly values for the last years, etc.) => quantity equal or larger than 0.01 m 3 /s management of water resources facilities - e.g. water transfers between river reaches or reservoirs (name, location of intake and of orifice, capacity, etc.)

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Structure of the Modules … is according to the river basin districts (Povodis) in the Czech Republic Upper Vltava, Lower Vltava, Berounka, Upper and Middle Labe, Ohre and Lower Labe. 4. Development of Modules

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Development of Modules …on the example of the module Upper and Middle Labe Upper Vltava, Lower Vltava, Berounka, Upper and Middle Labe, Ohre and Lower Labe. 4. Development of Modules rivers calculation profiles reservoirs water users

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Results …for different fields/sectors and locations as example for possible kinds of analysis: Effects of climate change on natural streamflows Effects of climate change on regulated (managed) streamflows Effects of climate change for different water users Effects of climate change on filling of reservoirs 5. First Results

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Effects of climate change on natural streamflows 5. First Results

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Effects of climate change on regulated (managed) streamflows 5. First Results

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Safety of drinking water provision for the city of Prague Drinking water for the city of Prague is provided by three sources: Withdrawal directly from the river Vltava in Prague, Transfer from the area between the cities of Sojovice and Karany (bank filtration), Transfer from reservoir Svihov (Zelivka). Prague 5. First Results

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Reservoir Svihov (Zelivka) Comparison of real values for withdrawal (years ) with simulated values for all ten periods (years ). 5. First Results

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Inflow to Germany downstream reservoir Prisecnice (at Schmalzgrube / Preßnitz) – modules for the rivers Ohre and Mulde 5. First Results

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Filling of Reservoirs 5. First Results Lipno I Orlik Hracholusky Rozkos Nechranice

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Conclusions: Climate change will affect water availability in the Czech part of the Elbe River Basin Affects will be different at different locations and within seasons (e.g. rising streamflows during winter and falling streamflows during summer and autumn) Streamflows during low flow episodes will fall generally Drinking water provision from reservoirs is sector most affected, for other water users water can be provided with high safety Under extreme dry conditions the water level in some reservoirs will fall significantly while other reservoirs are unaffected Adapted/changed management of reservoirs might compensate for some of the effects of climate change Outlook: Analysis of results in consultation of Povodis (e.g. for 4 th Status Report) Inclusion of changing water demand for large water users (e.g. power stations) and calculation of effects 6. Conclusion and Outlook

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Thank You for your attention!

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Reservoir Prisecnice: DWS, comparison of real values with simulated values

GLOWA-Elbe II Statuskonferenz 14. Dez Potsdam Hagen Koch et al., BTU Cottbus Filling of reservoirs